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Note that these equations do not include any pass-band
or evolutionary corrections.

=head2 Integration Technique

All integrations are performed using Romberg's method, which
is an iterative scheme using progressively higher-degree
polynomial approximations. The method stops when the answer
converges (ie the absolute difference in the values from the
last two iterations is smaller than the C<ABSTOL>
parameter, which is described in the L<new|/new> method).

Typically, the romberg integration scheme produces greater
accuracy for smooth functions when compared to simpler
methods (e.g. Simpson's method) while having little extra
overhead for badly-behaved functions.

=head1 CONSTANTS

Currently the following constants are available via